<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<h2>二级标签</h2>
		<h3>三级标签</h3>
		<script type="text/javascript">
			document.querySelector("h2","h3").style.backgroundColor="#009966";
		</script>
	</body>
</html>
